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linux/drivers/ide/ide-atapi.c
Borislav Petkov 2207fa5af1 ide-floppy: use drive->pc_callback instead of pc->callback 
It is important that drive->pc_callback is set prior to enabling IRQs on the
device since this is called from the IRQ handler. Otherwise it hurts as I learnt
the hard way from the several "Kernel panic - not synching: Fatal exception in
interrupt" during the weekend :).

The if-else block in the IRQ handler is only temporary so that bisect searches
don't break and it'll be removed after converting the remainder of the drivers.

There should be no functionality change resulting from this patch.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2008-07-23 19:55:59 +02:00

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/*
* ATAPI support.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <scsi/scsi.h>
#ifdef DEBUG
#define debug_log(fmt, args...) \
printk(KERN_INFO "ide: " fmt, ## args)
#else
#define debug_log(fmt, args...) do {} while (0)
#endif
/* TODO: unify the code thus making some arguments go away */
ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
{
ide_hwif_t *hwif = drive->hwif;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
xfer_func_t *xferfunc;
unsigned int temp;
u16 bcount;
u8 stat, ireason, scsi = drive->scsi;
debug_log("Enter %s - interrupt handler\n", __func__);
if (pc->flags & PC_FLAG_TIMEDOUT) {
if (drive->media == ide_floppy)
drive->pc_callback(drive);
else
pc->callback(drive);
return ide_stopped;
}
/* Clear the interrupt */
stat = tp_ops->read_status(hwif);
if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
if (hwif->dma_ops->dma_end(drive) ||
(drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
if (drive->media == ide_floppy && !scsi)
printk(KERN_ERR "%s: DMA %s error\n",
drive->name, rq_data_dir(pc->rq)
? "write" : "read");
pc->flags |= PC_FLAG_DMA_ERROR;
} else {
pc->xferred = pc->req_xfer;
if (update_buffers)
update_buffers(drive, pc);
}
debug_log("%s: DMA finished\n", drive->name);
}
/* No more interrupts */
if ((stat & DRQ_STAT) == 0) {
debug_log("Packet command completed, %d bytes transferred\n",
pc->xferred);
pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
local_irq_enable_in_hardirq();
if (drive->media == ide_tape && !scsi &&
(stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
stat &= ~ERR_STAT;
if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
/* Error detected */
debug_log("%s: I/O error\n", drive->name);
if (drive->media != ide_tape || scsi) {
pc->rq->errors++;
if (scsi)
goto cmd_finished;
}
if (pc->c[0] == REQUEST_SENSE) {
printk(KERN_ERR "%s: I/O error in request sense"
" command\n", drive->name);
return ide_do_reset(drive);
}
debug_log("[cmd %x]: check condition\n", pc->c[0]);
/* Retry operation */
retry_pc(drive);
/* queued, but not started */
return ide_stopped;
}
cmd_finished:
pc->error = 0;
if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
(stat & SEEK_STAT) == 0) {
dsc_handle(drive);
return ide_stopped;
}
/* Command finished - Call the callback function */
if (drive->media == ide_floppy)
drive->pc_callback(drive);
else
pc->callback(drive);
return ide_stopped;
}
if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
printk(KERN_ERR "%s: The device wants to issue more interrupts "
"in DMA mode\n", drive->name);
ide_dma_off(drive);
return ide_do_reset(drive);
}
/* Get the number of bytes to transfer on this interrupt. */
ide_read_bcount_and_ireason(drive, &bcount, &ireason);
if (ireason & CD) {
printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
return ide_do_reset(drive);
}
if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
/* Hopefully, we will never get here */
printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
"to %s!\n", drive->name,
(ireason & IO) ? "Write" : "Read",
(ireason & IO) ? "Read" : "Write");
return ide_do_reset(drive);
}
if (!(pc->flags & PC_FLAG_WRITING)) {
/* Reading - Check that we have enough space */
temp = pc->xferred + bcount;
if (temp > pc->req_xfer) {
if (temp > pc->buf_size) {
printk(KERN_ERR "%s: The device wants to send "
"us more data than expected - "
"discarding data\n",
drive->name);
if (scsi)
temp = pc->buf_size - pc->xferred;
else
temp = 0;
if (temp) {
if (pc->sg)
io_buffers(drive, pc, temp, 0);
else
tp_ops->input_data(drive, NULL,
pc->cur_pos, temp);
printk(KERN_ERR "%s: transferred %d of "
"%d bytes\n",
drive->name,
temp, bcount);
}
pc->xferred += temp;
pc->cur_pos += temp;
ide_pad_transfer(drive, 0, bcount - temp);
ide_set_handler(drive, handler, timeout,
expiry);
return ide_started;
}
debug_log("The device wants to send us more data than "
"expected - allowing transfer\n");
}
xferfunc = tp_ops->input_data;
} else
xferfunc = tp_ops->output_data;
if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
(drive->media == ide_tape && !scsi && pc->bh) ||
(scsi && pc->sg))
io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
else
xferfunc(drive, NULL, pc->cur_pos, bcount);
/* Update the current position */
pc->xferred += bcount;
pc->cur_pos += bcount;
debug_log("[cmd %x] transferred %d bytes on that intr.\n",
pc->c[0], bcount);
/* And set the interrupt handler again */
ide_set_handler(drive, handler, timeout, expiry);
return ide_started;
}
EXPORT_SYMBOL_GPL(ide_pc_intr);
static u8 ide_read_ireason(ide_drive_t *drive)
{
ide_task_t task;
memset(&task, 0, sizeof(task));
task.tf_flags = IDE_TFLAG_IN_NSECT;
drive->hwif->tp_ops->tf_read(drive, &task);
return task.tf.nsect & 3;
}
static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
{
int retries = 100;
while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, retrying\n", drive->name);
udelay(100);
ireason = ide_read_ireason(drive);
if (retries == 0) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, ignoring\n",
drive->name);
ireason |= CD;
ireason &= ~IO;
}
}
return ireason;
}
ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout,
ide_expiry_t *expiry)
{
ide_hwif_t *hwif = drive->hwif;
ide_startstop_t startstop;
u8 ireason;
if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
printk(KERN_ERR "%s: Strange, packet command initiated yet "
"DRQ isn't asserted\n", drive->name);
return startstop;
}
ireason = ide_read_ireason(drive);
if (drive->media == ide_tape && !drive->scsi)
ireason = ide_wait_ireason(drive, ireason);
if ((ireason & CD) == 0 || (ireason & IO)) {
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
"a packet command\n", drive->name);
return ide_do_reset(drive);
}
/* Set the interrupt routine */
ide_set_handler(drive, handler, timeout, expiry);
/* Begin DMA, if necessary */
if (pc->flags & PC_FLAG_DMA_OK) {
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
hwif->dma_ops->dma_start(drive);
}
/* Send the actual packet */
if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
hwif->tp_ops->output_data(drive, NULL, pc->c, 12);
return ide_started;
}
EXPORT_SYMBOL_GPL(ide_transfer_pc);
ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout,
ide_expiry_t *expiry)
{
ide_hwif_t *hwif = drive->hwif;
u16 bcount;
u8 dma = 0;
/* We haven't transferred any data yet */
pc->xferred = 0;
pc->cur_pos = pc->buf;
/* Request to transfer the entire buffer at once */
if (drive->media == ide_tape && !drive->scsi)
bcount = pc->req_xfer;
else
bcount = min(pc->req_xfer, 63 * 1024);
if (pc->flags & PC_FLAG_DMA_ERROR) {
pc->flags &= ~PC_FLAG_DMA_ERROR;
ide_dma_off(drive);
}
if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
if (drive->scsi)
hwif->sg_mapped = 1;
dma = !hwif->dma_ops->dma_setup(drive);
if (drive->scsi)
hwif->sg_mapped = 0;
}
if (!dma)
pc->flags &= ~PC_FLAG_DMA_OK;
ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
bcount, dma);
/* Issue the packet command */
if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
ide_execute_command(drive, WIN_PACKETCMD, handler,
timeout, NULL);
return ide_started;
} else {
ide_execute_pkt_cmd(drive);
return (*handler)(drive);
}
}
EXPORT_SYMBOL_GPL(ide_issue_pc);
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